I'm looking to change the stock gears to 373 .i got ford to give me a price quote . They want 785 dollars seems like a lot of money to change gears that cost 150 dollars .is this price fair or way out of the ballpark .plus they warranty their work .dont want to get ripped off

I went to a shop (previous stangs ) that I new at least 3 people went to an had zero issues... w gears if installed improperly will cause a horrendous noise... sorta like the sound Jim carry made in dumb and dumber...